I have been Trouble shooting my gmc for a couple months, replaced my Fuel pump, fuel filter a couple spark plugs a vacuum hose and cleaned up a bunch of plugs that were corroded. The rig finally started up and was able to drive around the block but is running pretty ruff, meaning acceleration makes the car bog down pretty bad, and it bogs down when i shift from park to revers neutral drive etc it almost dies. ? IAC valve ?
99 GMC Yukon Denali
- Thread starter SantaE89
- Start date
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SunlitComet
OBS Jedi-Do Good
If a plug was corroded replace it. Do not try and clean for further use. You can also clean the throttle body after removing it from the engine and removing its electronic components. But before you do run a test for me start engine when cold. Does the engine high idle and then slow down as it gets warmer? Turn your steering to lock. When you hit the lock point and hold it there, does the engine bog down and then speed up to somewhat normal idle?. And grab a pressure test of the new fuel pump in action using the pressure test port on top of the engine.
2door2wheel
Full Access Member
i had a similar issue in my truck and it turned out to be the crappy airtex fuel pump. i put in a delco and immediately the issue was gone .
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